Implementing hold-down timers in routing protocols will prevent the formation of routing loops by ensuring that once a route is declared unreachable, it will not be advertised again until the hold-down period expires.
Hold-down timers are used in dynamic routing protocols to prevent the formation of routing loops. When a route is reported as unreachable, the hold-down timer starts, and during this time, further updates trying to reinstate the route are ignored. This prevents the possibility of routing updates that could cause a loop from being accepted immediately, providing a window for the network to converge on a new topology. This statement is accurate as the intent of hold-down timers is indeed to stabilize the routing table, thus making the true statement correct. However, while hold-down timers can help prevent routing loops, they are not the only mechanism in place to do so, and their implementation must be done carefully to avoid unnecessarily increasing convergence time.
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What are routing loops and how do they occur?
What are the different types of routing protocols that use hold-down timers?
How does the hold-down timer affect network convergence time?